Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b9bcbe3e3d96c2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 15:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb121945309d1a88e4aadab0c810089b SHA-1: da6594b04e60e488918f6edba764612c10aa8b6e SHA-256: 29b9bcbe3e3d96c2a26855d0acb775fc941d332e51b48c3b9c057e4d2d1b2d3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised sites and employing a remote-support tool lure. The document's structure and embedded links suggest an attempt to trick users into downloading or interacting with malicious content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://accidentmatters.com/ckfinder/userfiles/files/dudetutamixobomatonofi.pdf In PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/38567210420.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/nezebotubuguxeber.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89907941171.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/bipajiwonuxekot.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef64b8d7d---lovirakatam.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/sopitipodepagaj.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bfec1ca3---97482251607.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b65a8651---69994333430.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jexurerokum.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/84884422721.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/xikodimabad.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/sonifuf.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/77345885689.pdfIn PDF document text
    • http://immopolignano.lu/images/zanalisilufigixe.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/32943187803.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/junexanugibutupatera.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/28337482752.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/97966674581.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/wenekepalezaradomud.pdfIn PDF document text
    • https://websbag.com/uploads/files/bifad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+can+i+recover+my+icloud+password+without+email+and+security+questionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 17392 bytes
SHA-256: 4648c690eb9095c0dfa5f3d61eff7a3215874b6ed7f37a2519d4a39ef1affc3e
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 11284 bytes
SHA-256: 3f2f95de39877e5e303606793b40a90e7aa020d6e79c4cc639bfb0abed253bcd

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